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wu0322

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The actual state, hazards, and prevention and comprehensive treatment of "White Pollution"Abstract: The invention of plastic bag brings people lots of However, with widespread use and lack of environmental awareness, plastic bags have generated some hazards to the life of Along with the development of economy, "White pollution" has been becoming a public which negatively affect the sustainable China has employed various manners to prevent and treat it to return the green to earth Key words:"White pollution", actual state in our country hazard, reasons of formation, prevention manners, comprehensive treatment

化学研究生毕业论文英文版

264 评论(12)

icokeee

学校应该都有论文写作指导的吧。都写了那么多年的实验报告了,范文这个东西真得那么必要么?
308 评论(12)

人面大桃花

According to according to Lambert - Bill law, when after wave length, liquid sheet thickness determination, the extinction and the colored material density is This experiment is with and so on the mole of series law carries on the determination, compounds pH5~8 the series sulfosalicylic acid copper solutions, in which sulfosalicylic acid and the cupric ion total material quantity is invariable, but both mole fraction changes Determines this a series of material with the spectrophotometer the Take a sulfosalicylic acid mole fraction as the x-coordinate, the extinction is the y-coordinate, makes the extinction constitutional The solution composition corresponds which with the extinction maximum value then is this preparation Through between the ionicity and the extinction, the apparent stability constant relations carry on the computation, may obtain the sulfosalicylic acid copper apparent stability This experiment is the typical comprehensive nature, the designed experiment, it synthesized the volumetric analysis elementary operation eo skill, the spectral analysis, knowledge and so on chemical literature consult method, and has designed, the zetetic It uses in the volumetric analysis and the modern instrumental analysis technology determining the preparation the stability constant, synthesized the volumetric analysis, the spectral analysis, the experimental operation as well as the computer technology Thus sharpens student's practice ability This experimental method is extremely simple, fast, and does not need the complex instrument to be possible to determine the preparation the composition and the apparent stability Provides certain reference for the preparation Key words: Preparation, composition, apparent stability constant, and so on mole of series law
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